Grinding-mill.



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l..| M P P A nl, E 5 N n f M o. a N W No. 795,133. PATENTED JULY 18, 1905.

M. s. solamsoN.` GRINDING MILL.

APPLICATION FILED AUG. 21,1901.

4 SHEETS-SHEET 2.

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I 'Vl LVESS No. 795.133. PATENTED JULY 18, 1905, M. S. JOHNSN.

GRINDING MILL.

APPLICATION FILED AUG. 21| 1901.

4 SHEETS-SHEET 3.

Munnw n cMuAM im nwruLmlocRNHrm v/Aslumrmn ne Nuo. 795,133. PATENTBD JULY 18. 1905. M. S. JOHNSON.

GRUNDING MILL.. APPLIGATION FILED AUG'.21.1901.

4 SHEETS-SHEET 4.

'@f. f4 47 @L54 Patented July 18, 1905.

PATENT Oriana.

MILTON S. JOHNSON, OF YORK, PENNSYLVANIA.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent 0.7 795,133, dated July 18, 1905.

Application filed August 21, 1901. Serial No. 72,787.

To /r/ZZ wlfa'm, if; Vm/fty/ concern:

Be it known that I, MILTON S. JOHNSON, a citizen of the United States, residing at York,

l in the county of York and State of Pennsyl- S Vania, have invented certain new and useful Improvements in Grinding-Mills; and I do declare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to a machine for grinding materials for various purposes, and is particularly well adapted for grinding' into fine particles materials used in the manufacture of explosive powders, although it may be used for other purposes.

The invention has for its object to provide a machine in which the material will be reduced or ground into fine particles by a number of beaters arranged as hereinafter described in a cylinder, the strong circulation of air being maintained in said cylinder, so as to expeditiously dry the material during the grinding operation, the degree of fineness to which the material may be reduced being kregulated by certain valves arrangedas hereinafter specified whereby the material may be held within the grinding-cylinder a longer or shorter period of time,.according to the degree of fineness to which the material is to be reduced.

The invention has also for its object to simplify the construction of such a machine and to provide a construction in which the strain upon the parts will be reduced to the minimum and in which increased efficiency is obtained.

To the accomplishment of the foregoing and such other objects as may hereinafter appear,

lthe invention consists in the construction and in the combination of parts hereinafter particularly described and then sought to be clearly defined by the claims, reference being had to the accompanying' drawings, forming a part hereof, and in which-- Figure 1 is a plan view of the machine; Fig. 2, aside elevation, partly in section; Fig. 3, a sectional detail showing application of the slide-valves. Fig. 4 is a vertical section on line 4 4 of Fig. 2. Fig. 5 is a transverse section on line 5 5 of Fig. 2. Fig. 6 is a front elevation of one set of beaters, showing one arm with the beater removed. Fig. 7 is aside view of one set of beaters with certain parts detached, and Fig. 8 is a transverse section on line 8 8 of Fig. 2.

In the drawings the numeral 1 designates a bed-plate formed with suitable boXings 2, in

lwhich is journaled the driving-shaft 3, provided with the driving-pulleys 4, located atopposite sides of the grinding-cylinder 5, the lower portion or half of said cylinder being cast with the bed 1 or otherwise may be made as a part thereof, and the boxings 2 may be provided with oil-cups 6. The upper portion or half of the cylinder 5 is made separate from the lower part, and the two parts are held together by means of bolts 7, passed through ianges 8, projecting from the two parts of the cylinder. The interior of the cylinder is lined with steel or other hardened plates 9, of which ,two are illustratedone fitting' in the lower half and the other in the upper half of the cylinder, the meeting edges of the plate being provided with overlapping shoulders 10, as illustrated in Fig. 5 of the drawings, and the eX- posed faces of the plates are formed with a corrugated or undulating surface 11, so as to cooperate with the beaters hereinafter described for grinding or comminuting the material being reduced.

The beaters are formed of a number of arms 12, extending radially from the shaft.3 and provided with detachable blades 13. The blades are formed with shanks 14, which bear against the rear of the arms 12, the arms being formed with a reduced portion 15 to receive the shanks of the blades, said Shanks being formed each with a lug or shoulder 16, which fits in a depression 17, formed in the arm, so as to prevent outward longitudinal movement of the blade on its arm, and the ends of the arms are each formed with a dovetailed tongue 17 to lit in a correspondinglyshaped groove 17" in the edge of the beater, so as to assist in holding the parts together. The blades are secured to the arms by means secured to the slide 28.

of rings or collars 18, which encircle the arm and the shank portion of the blades and which are provided with set-screws 19, by which to tighten the collars, and thus securely clamp the blades to the radiating arms. Any desired number of these beaters are employed, and they will be so arranged within the cylinder 5 as to extend in lines forming a spiral :from the receiving end of the cylinder toward the discharge end, so as to facilitate the movement or vfeed of the material through the cylinder. By attaching' the blades to the beaterarms in the manner indicated they can be readily removed and replaced by a new one or by a beater ot' a different form, according to the character o't' the material to be reduced and the action desired thereon".

For the purpose of creatingr an air-blast through the grinding-cylinder 5, so as to dry the material and at the same time impel it into the receptacle or receiving-room for the ground material, l locate a partition 2O inside of the cylinder, near the discharge end thereot', so as to 'lorm a compartment 21, in which will be located a fan composed of the arms 22, extending from a hub 23, which will be bolted to the shaft 3, said arms 22 having the fanblades 24. A spout 25 leads from the t'anchamber and will discharge into the receivingroom for the ground material. The adjacent ends of the partition 20. next to the shaft 3 have a portion removed, so as to form an opening 26 for the passage of the-material from the grinding-cylinder into the fan-chamber. For the purpose of var ving the size of this opening, so as to increase or lessen the speed ot' discharge from vthe grinding-cylinder into the feed-chamber, and thus regulate the degree of ineness to which the material is to be groundY-by holding it a longer or a shorter period within the grinding-cylinder, 1 provide two slide-valves 27 and 28, one above and the other below the shaft 3, which valves are adapted to be moved toward and from each other across the opening 26 in the partition '20, so as to regulate the size of the opening by the adjustment of these valves. rlhe valves are operated by means of a threaded rod or screw 29, which is formed with right-hand threads 30 for a portion of its length and with lett-hand threads 31 for another portion ol its length, which portion may be reduced in diameter, as illustrated in Fig. 3 drawings, said rod passing through a suitable bearing 32 on the grinding-cylinder and having' its right-hand threaded portion engaging' a threaded nut 33 on the slide 27 and its left-hand threaded portion engaging a threaded nut 34, formed on or as a part of a yoke 35, which straddles the shaft 3 and is By turning the rod or screw 29 in one direction the two slidevalves are drawn toward each other, so as to reduce the size of the exit-opening 26 in the partition 20, and by turning the rod in the roll 45.

of theopposite direction the slide-valves are separated and the exit-opening thus enlarged. In this manner the exit o't' the material from the grinding-cylinder into the fan-chamber can be regulated and controlled to a nicety and the degree or' iineness to which the material is to be reduced can be regulated within quite large limits. The partition 20 will be recessed for a portion of its length from the top downwardly, so that the operating-rod 29, carrying the nuts ofthe slide-valve, may work within said recess.

The material to be ground is received into the cylinder 5 from a feed-hopper 36, the opening between-which and the cylinder is controlled by slide-valve 37, which is raised and lowered by a hand-wheel 38, engaging the threaded portion ot' a rod 39, extending from the slide-valve 37 and through a suitable bearing 4() at the top ot' the cylinder 5, the other slide-valve-operating rod 29 being operated by a hand-wheel 41.

rlhe material to be reduced in the grindingcylinder 5 is subjected to a preliminary reduction before entering the inlet feed-hopper 36 to the grinding-cylinder, which preliminary reduetion is effected by means which I shall now describe.

The numeral 42 designates two standards suitably bolted to the bed-plate 1 and which may be connected together by the brace-rods 43. These standards support two crushingrolls 44 and 45, which may have a smooth surface, as indicated by the roll 44, or a roughened or toothed surface. as indicated by the rlhe journals of the roll 45 fitin boxes 46, which are held in a stationary position in the ways 47, formed in the tops ot' the standards 42, by means of bolts 48, while the journals of the rolls 44 fit in boxes 49', adapted to slide in the ways' 47 in the tops of the standards 42, said sliding boxes being each under the iniiuence of a coiled spring 50, which at one end lits around a stud 51, projecting from the box 49, and at the other end fitting around a stud 52, projecting from a sliding block 53, which is moved back and the standard 42 and provided with a handwheel 55, so that by compressing said springs by the screws, operating as specified, the roll mounted in the sliding boxes will be pressed against the other roll with more or less pressure, according to the tension placed upon the springs, and thus regulate the crushing pressure exerted by the two rolls upon the material thus subjected to a preliminary reduction. The material is Jfed to the crushingrolls Vfrom a hopper56, which is formed with iangcs 57, by which and the bolts 58 the hopper is secured to the top ot' the standards 42, the walls ot' the hopper converging inwardly and the two rolls filling the discharge-opening in the bottoni ot' the hopper', the side walls of the hopper fitting quite closely to the sur- IOO IIO

forth by a screw 54, swiveled in the end of face of the rolls and the end walls overlapping the ends of the rolls.

The numerals 59 designate caps'which encircle the journals of both rolls on both sides of each of the standards 42, and thus serve as a housing to protect the journals at those points.

The material crushed by the rolls 44 and 45 falls into a trough 60, which delivers it into` the hopper 36 of the grinding-cylinder 5. This trough is adapted to oscillate` and it inclines from its rear to its forward end. The rear end of the trough is formed with an extension 6l, through which passes a pintle 62, extending' from the underside of the top portion of the rear standard 42, so that the trough may turn upon the pintle as a pivot, a pin 63, passed through the pintle, and a washer 64, interposed between said pin and the extension 61, serving to hold the trough to the pintle. The trough at its forward end is suspended by means of a link 66, supported by the extension of one of the brace-rods 43 and having its lower end connected by a pin 67 to a bar 68, extending from the side of the trough next thereto, and by a rocking arm 69, fulcrumed upon the end of thc other brace-rod 43, extending from the other side of the standard 42 and having its lower end connected to the bar 68 by a pin 70. rlhe upper member of the rocking arm 69 is connected by a pin 71 to the eccentric-arm 72, which at its inner end has a collar 73 fitting around an eccentricpin 74 on the end of the journal of the crushing-roll 45, the collar 73 of the eccentric-arm being foimed in two parts, which are bolted together by bolts 75 passing through anges 76, projecting from the two parts of the collar, the outer end of arm 72 being held to the pin 71 by means of a washer 77 and nut 78. Under this construction the trough 60 is vibrated sidewise by means of the rocking arm 69, actuated by the eccentric mounted upon the journal of one of the crushing-rolls, and thus a constant and regular feed of material from the crushing-rolls to the feed-hopper of the grinding-cylinder is effected through the medium of the vibrating trough, which delivers the material from the crushing-rolls to the feed-hopper.

lhc crushing-101145 has a gear-wheel 79 mounted on its journal, which extends beyond the outer standard 42, and this wheel derives its motion from a toothed pinion 8l on the driving-shaft 3. It will thus be seen that the beaters in the grinding-cylinder 5 and the crushing-rolls are actuated from the same driving-shaft and that the trough beneath the crushing rolls receives its vibration from connections with one of the crushing-rolls, and thus there is a concert of action between the beaters of the grinding-cylinder and the crushing-rolls in reducing the material to the condition desired, as well as a concert of action with the trough which delivers the preliminarily-reduced material to the beaters of the grinding-cylinder for a further reduction.

I have illustrated and described with particularity the preferred details of construction and arrangement of the several parts; but it is obvious that there can be changes made in the details of some of the parts and essential features of my invent-ion still be retained.

Having described my invention and set forth its merits, what l claim is- 1. In a grinding-mill, the combination with a cylinder divided by a partition into a grinding-compartment and a fan-compartmen t, said partition having an opening formed in it for the passage of material from the grindingcompartmcnt into the fan-compartment, a shaft passing centrally through said cylinder and provided within the grinding-compartment with a series of beaters and with fanblades within the fan compartment, slidevalves for varying the size of thc opening in the partition, said valves fitting' one above and the other below the shaft and adapted to be moved toward and away from each other, and means for moving said valves toward and from each other, substantially as described.

2. In a grinding-mill, the combination with a cylinder divided by a partition into a grinding-compartment and a fan-compartment, said partition having an opening for the passage of material from the grinding-compartment into the fan-compartment, slide-valves for varying the size of the opening in the partition, a threaded rod provided withright and left hand threads in engagement with parts of the slide-valves for moving said valves toward and from each other, and a shaft passing centrally through the cylinder and provided within the grinding-compartment with a series of beaters and within the fan-compartment with fanblades, substantially as described.

3. [n a grinding-mill, the combination of a cylinder formed with a grinding-compartment, a rotatable shaft passed centrally through the cylinder, a series of beaters secured to said shaft, a vibrating trough for feeding material to the cylinder', and means for vibrating the trough, said means comprising a rocker-arm connected to the trough, an eccentric operatively connected with said arm, and a rotatable member connecting the eccentric with the shaft which carries the beaters so as to derive motion from said shaft, substantially as described.

4. In agrinding-mill, the combination with the cylinder formed with a grindiiig-compartment, of a shaft passed centrally through said cylinder and provided within the grindingcompartment with beaters, said heaters consisting of-arms extending from the shaft and removable blades formed with shanlis clamped to said arms by rings encircling the arms and shanls and secured by set-screws, substantially as described.

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5. In a grinding-mill, the combination with a grinding-cylinder formed with a feed-hopper, of crushing-rolls for effecting a preliminary reduction of the material, an oscillatory trough intermediate of the crushing-rolls and grinding-cylinder and receiving the material from the crushing-rolls and delivering it to the feed-hopper of the grinding-cylinder, said trough being pivoted at one end so as to swing laterally, a rocking arm connected with the the tension of said springs, substantially as described.

7. A grinding-mill comprising a cylinder provided with beaters, a drive-shaft for the same, crushing-rolls, means connecting said rolls with the drive-shaft of the beaters to derive motion therefrom, an oscillatory trough for delivering the material from the crushingrolls to the grinding-cylinder, said trough being pivoted at one end so as to have a lateral swing, a rocking arm and a swinging link connected with the trough to support the same at the end neXt to the grinding-cylinder, and an eccentric mounted on the journal of one of the crushing-rolls andconnected with one end of the rocking arm for transmitting an oscillatory movement to the trough from said crushing-roll, substantially as described.

In testimony whereof I affix my signature in i presence of two Witnesses.

MILTON S. JOHNSON. Witnesses:

J. A. ERWIN, R. H. GUIDEL. 

